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2004 Fiscal Year Final Research Report Summary

Brain-Inspired Memory Model

Research Project

Project/Area Number 14580425
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Intelligent informatics
Research InstitutionKyushu Institute of Technology

Principal Investigator

HAYASHI Hatsuo  Kyusyu Institute of Technology, Graduate School of Life Science and Systems Engineering, Department of Brain Science and Engineering, Professor, 大学院・生命体工学研究科, 教授 (00108664)

Project Period (FY) 2002 – 2004
KeywordsHippocampal network model / Memory / Recall / Stochastic resonance / LTP / STDP / Radial propagation / Sequence learning
Research Abstract

We obtained following results using a hippocampal network model based on the physiological knowledge.
1.Stochastic resonance took place in the present hippocampal model. The membrane potential fluctuations in CA1 pyramidal cells caused by complex spatiotemporal activity of the CA3 network works as a subthreshold noise, and a periodic perforant path signal to the CA1 network may be regarded as a subthreshold signal.
2.Memory patterns stored as spatial patterns of augmented Shaffer collateral synapses were recalled as activity patterns of the CA 1 network taking advantage of the stochastic resonance.
3.LTP was induced in Schaffer collateral synapses by the chaotic response of the CA3 network to a periodic stimulation; the CA3 network caused a delta rhythm spontaneously and Schaffer collateral synapses were modified depending on the Ca^<2+> concentration inside the CA1 pyramidal cells.
4.Bimodal distribution of recurrent synaptic conductances was achieved in the CA3 network by STDP. The avera … More ge synaptic weight and the frequency of the rhythmic activity were not altered after the convergence of the distribution even if the spatial distribution of synaptic weights was changed by learning, because LTP and LTD were induced simultaneously in recurrent connections.
5.When theta burst stimuli were fed into local sites in the CA3 network, radial propagation of neuronal activity was produced from the stimulus sites due to asymmetric augmentation of the recurrent connections. This radial propagation is regarded as a short-term memory because the propagation is repeated for about 30 s after the termination of stimuli ; the radial patterns of synaptic weight are modified with time by the spontaneous activity of the CA3 network through STDP.
6.Neurons in the CA1 network learned temporal sequence of signals fed into the hippocampal model using the radial propagation of neuronal activity in the CA3 network when Schaffer collateral synapses were subject to a STDP rule, besides recurrent synapses in the CA3 network. Less

  • Research Products

    (13 results)

All 2004 2002

All Journal Article (12 results) Book (1 results)

  • [Journal Article] Organization of Spatiotemporal Activity through STDP as a Mechanism for Coding Temporal Sequences in the Hippocampal Model.2004

    • Author(s)
      Motoharu Yoshida, Hatsuo Hayashi
    • Journal Title

      WSEAS Trans.Biol.Biomed. Vol.1

      Pages: 30-35

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Regulation of spontaneous rhythmic activity and organization of pacemakers as memory traces by STDP in the hippocampal CA3 model.2004

    • Author(s)
      Motoharu Yoshida, Hatsuo Hayashi
    • Journal Title

      Phys.Rev.E Vol.69

      Pages: 011910:1-011910:15

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Organization of cell assemblies that code temporal sequences in a hippocampal CA3-CA1 model.2004

    • Author(s)
      Motoharu Yoshida, Hatsuo Hayashi
    • Journal Title

      Proceedings of the International Joint Conference on Neural Networks

      Pages: 495-500

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] A memory model based on the dynamical behavior of the hippocampus.2004

    • Author(s)
      Hatsuo Hayashi, Motoharu Yoshida
    • Journal Title

      Proceedings of the International Conference on Knowledge-Based Intelligent Information and Engineering Systems Part 1

      Pages: 967-973

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] A memory model of the hippocampus for the foundations of brain-inspired information technology.2004

    • Author(s)
      Hatsuo Hayashi, Motoharu Yoshida
    • Journal Title

      International Congress Series (BrainIT I)

      Pages: 109-112

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Organization of Spatiotemporal Activity through STDP as a Mechanism for Coding Temporal Sequences in the Hippocampal Model.2004

    • Author(s)
      Motoharu Yoshida, Hatsuo Hayashi
    • Journal Title

      WSEAS Transactions on Biology and Biomedicine Vol.1

      Pages: 30-35

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Regulation of spontaneous rhythmic activity and organization of pacemakers as memory traces by STDP in the hippocampal CA3 model.2004

    • Author(s)
      Motoharu Yoshida, Hatsuo Hayashi
    • Journal Title

      Physical Review.E Vol.69, 011910

      Pages: 1-15

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] A memory model based on the dynamical behavior of the hippocampus.2004

    • Author(s)
      Hatsuo Hayashi, Motoharu Yoshida
    • Journal Title

      Proceedings of the International Conference on Knowledge-Based Intelligent Information and Engineering Systems

      Pages: 967-973

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] A memory model of the hippocampus for the foundations of brain-inspired information technology.2004

    • Author(s)
      Hatsuo Hayashi, Motoharu Yoshida
    • Journal Title

      International Congress Series 1269(BrainlT I)(Elsevier)

      Pages: 109-112

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Stochastic resonance in the hippocampal CA3-CA1 model : a possible memory recall mechanism.2002

    • Author(s)
      Motohau Yoshida, Hatsuo Hayashi, Katsumi Tateno, Satoru Ishizuka
    • Journal Title

      Neural Networks Vol.15

      Pages: 1171-1183

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Regulation of spontaneous rhythmic activity and preserved stimulus dependent pattern by STDP in the hippocampal CA3 model.2002

    • Author(s)
      Motoharu Yoshida, Hatsuo Hayashi
    • Journal Title

      Proceedings of the International Conference on Neural Information Processing Vol.1

      Pages: 367-371

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Stochastic resonance in the hippocampal CA3-CA1 model : a possible memory recall mechanism.2002

    • Author(s)
      Motoharu Yoshida, Hatsuo Hayashi, Katsumi Tateno, Satoru Ishizuka
    • Journal Title

      Neural Networks Vol.15

      Pages: 1171-1183

    • Description
      「研究成果報告書概要(欧文)」より
  • [Book] バイオミメティックスの新展開2002

    • Author(s)
      林 初男
    • Total Pages
      22
    • Description
      「研究成果報告書概要(和文)」より

URL: 

Published: 2006-07-11  

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